Associated Press PhotoA woman pushes her luggage past flowers at a site of a blast at Domodedovo airport near Moscow on Tuesday, Jan. 25, 2011, as others wait for a security check to enter. Security was tightened in Moscow on Tuesday, after a suicide bomber set off an explosion that ripped through Moscow's busiest airport on Monday.

MOSCOW -- President Dmitri A. Medvedev on Tuesday sharply questioned security precautions at the
airport on Moscow that was hit by a suicide bomber on Monday, saying that
officials must be held responsible for failing to prevent the devastating
attack.